Preparation and characterization of high refractive index silicone/TiO2 nanocomposites for LED encapsulants

Huang, Jui-Hsiung; Li, Chiuping; Chang‐Jian, Cai‐Wan; Lee, Kuen-Chan; Huang, Jen-Hsien

doi:10.1016/j.jtice.2014.09.008

Cited by 19 publications

(7 citation statements)

References 27 publications

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“…The blending method is a simple route for preparing LED packing nanocomposite materials. The nanoparticles are highly prone to agglomeration and usually require modification to increase the dispersion in polymer matrix before they are incorporated into the silicone resins . The sol‐gel process is exactly one‐step preparation method based on the hydrolysis of metal alkoxides to prepare organic‐inorganic hybrid materials.…”

Section: Introductionmentioning

confidence: 99%

Preparation of ZrO₂/silicone hybrid materials for LED encapsulation via in situ sol‐gel reaction

Huang

Feng

Sun

et al. 2019

Polymers for Advanced Techs

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Organic silicones have been used as encapsulant materials for light‐emitting diodes (LEDs) for many years, while their performances need to be improved in order to satisfy the requirements of high‐power LEDs. A ZrO2/silicone hybrid resin (ZHR) was synthesized for LEDs encapsulation by in situ sol‐gel reactions. The oligosiloxane was synthesized as polymeric matrix by nonaqueous sol‐gel condensation using diphenylsilanediol (DPSD), vinyltrimethoxysilane (VTMS), and 3‐methacryloxy propyl trimethoxysilane (MPTMS) as monomers. Then zirconium propoxide was added into this polymeric matrix to be hydrolyzed to obtain the hybrid resin with a uniform dispersion of ZrO2 nanoparticles. The Si–O–Zr covalent bond was detected and benefited for excellent dispersibility of the ZrO2 nanoparticles and the well compatibility between organic and inorganic phases. The cured ZHR with 5 wt% ZrO2 content showed high light transmittance (greater than 80% in visible light range), high refractive index (=1.56), and high thermal stability (no yellowing at 150°C for 240 hours). The luminous flux of the LED chip with ZHR encapsulant was 10% higher than that of the pure silicone resin, suggesting that ZHR has great application potential in the field of LED packaging.

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Section: Introductionmentioning

confidence: 99%

Preparation of ZrO₂/silicone hybrid materials for LED encapsulation via in situ sol‐gel reaction

Huang

Feng

Sun

et al. 2019

Polymers for Advanced Techs

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“…22 The introduction of crystalline ZrO 2 , 1,33-43 TiO 2 (ref. [44][45][46][47][48][49] nanoparticles into siloxane are more effective to increase the RI because the RI of the nanoparticle increases dramatically with crystallinity. ZrO 2 has excellent optical properties, such as Abbe number and transparency on a broad spectral range, 50 as well as chemical inertness and thermal stability.…”

Section: Introductionmentioning

confidence: 99%

Zirconia/phenylsiloxane nano-composite for LED encapsulation with high and stable light extraction efficiency

et al. 2021

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“…High refractive index, low moisture absorption, and high thermal conductivity are several key properties for encapsulated resins. However, the refractive indexes (1.45–1.55) of most encapsulation resins are lower than that of LED chips (~2.20), resulting in serious light loss because of the total reflection on the interface 3,4 . In addition, conversion from reflected light energy to heat energy will lead to chip heating, thus increasing the difficulty in thermal conductivity and the risk of fire.…”

Section: Introductionmentioning

confidence: 99%

Effect of sulfur in different valence on flame retardance of epoxy resin for light emitting diode

Luo

Nan

Zuo

et al. 2020

J of Applied Polymer Sci

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A novel phosphorus/nitrogen‐containing flame retardant (DOPO‐AM) was synthesized by 9,10‐dihydro‐9‐oxa‐10‐phosphaphenanthrene‐10‐oxide (DOPO) and acrylamide (AM) and its chemical structure was characterized. DOPO‐AM was added into diglycidyl ether of bisphenol‐A (DGEBA) with curing agent m‐xylylenediamine (MXDA)to prepare flame retarded epoxy resin to reduce the possibility of fire. The compounds with different valences sulfur respectively replace partial DGEBA resin to study the effects of sulfur valences on the flame retardance of epoxy resins. The results indicated that DOPO‐AM had excellent flame retardance for epoxy resin. When phosphorus content was only 0.75%, DGEBS resin containing DOPO‐AM achieved the limiting oxygen index value of 34.55% and vertical burning test (UL‐94) V‐0 rating. Although sulfur element is help for refractive index of epoxy resin, sulfur element in three kinds of valences all weaken the flame retardant of epoxy resin. Improving phosphorus content is help for the synergistic effect of PN and PNS. Moreover, the flame retardance is not proportional to sulfur valence, sulfide with +2 valence had the best flame retardance. However, +6 valence sulfonic with strong oxidation effect worsen the flame retardant. Simultaneous thermal analysis of thermogravimetric analyzer and differential scanning calorimeter and scanning electronic microscopy photographs verified the above conclusion.

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Preparation and characterization of high refractive index silicone/TiO2 nanocomposites for LED encapsulants

Cited by 19 publications

References 27 publications

Preparation of ZrO₂/silicone hybrid materials for LED encapsulation via in situ sol‐gel reaction

Preparation of ZrO₂/silicone hybrid materials for LED encapsulation via in situ sol‐gel reaction

Zirconia/phenylsiloxane nano-composite for LED encapsulation with high and stable light extraction efficiency

Effect of sulfur in different valence on flame retardance of epoxy resin for light emitting diode

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Preparation and characterization of high refractive index silicone/TiO2 nanocomposites for LED encapsulants

Cited by 19 publications

References 27 publications

Preparation of ZrO2/silicone hybrid materials for LED encapsulation via in situ sol‐gel reaction

Preparation of ZrO2/silicone hybrid materials for LED encapsulation via in situ sol‐gel reaction

Zirconia/phenylsiloxane nano-composite for LED encapsulation with high and stable light extraction efficiency

Effect of sulfur in different valence on flame retardance of epoxy resin for light emitting diode

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Preparation of ZrO₂/silicone hybrid materials for LED encapsulation via in situ sol‐gel reaction

Preparation of ZrO₂/silicone hybrid materials for LED encapsulation via in situ sol‐gel reaction